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node_modules/cesium/Build/CesiumUnminified/Workers/createVerticesFromQuantizedTerrainMesh.js

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+/**
+ * @license
+ * Cesium - https://github.com/CesiumGS/cesium
+ * Version 1.144.0
+ *
+ * Copyright 2011-2022 Cesium Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Columbus View (Pat. Pend.)
+ *
+ * Portions licensed separately.
+ * See https://github.com/CesiumGS/cesium/blob/main/LICENSE.md for full licensing details.
+ */
+
+import {
+  TerrainProvider_default
+} from "./chunk-O3DKEX7Q.js";
+import {
+  EllipsoidalOccluder_default,
+  TerrainEncoding_default
+} from "./chunk-UF46SZEZ.js";
+import {
+  createTaskProcessorWorker_default
+} from "./chunk-W5OCKMPJ.js";
+import {
+  WebMercatorProjection_default
+} from "./chunk-B3QHNA4A.js";
+import "./chunk-TNWKJNUZ.js";
+import {
+  AxisAlignedBoundingBox_default
+} from "./chunk-7XM5JK5F.js";
+import {
+  IndexDatatype_default
+} from "./chunk-6FHT43QR.js";
+import "./chunk-2H5264K7.js";
+import "./chunk-CQNFIAZU.js";
+import {
+  Rectangle_default,
+  Transforms_default
+} from "./chunk-CRCGE4J4.js";
+import {
+  Matrix4_default
+} from "./chunk-ERKUET22.js";
+import "./chunk-DSGLDRTI.js";
+import "./chunk-YGFVAGYF.js";
+import "./chunk-FQ42MT7M.js";
+import {
+  Cartesian2_default,
+  Cartographic_default,
+  Ellipsoid_default
+} from "./chunk-UAZUP4I5.js";
+import {
+  Cartesian3_default
+} from "./chunk-SA2A2AN5.js";
+import {
+  Math_default
+} from "./chunk-ACTVJHSP.js";
+import "./chunk-XLQZNQ4Z.js";
+import {
+  defined_default
+} from "./chunk-PCL3Y7H5.js";
+
+// packages/engine/Source/Workers/createVerticesFromQuantizedTerrainMesh.js
+var maxShort = 32767;
+var cartesian3Scratch = new Cartesian3_default();
+var scratchMinimum = new Cartesian3_default();
+var scratchMaximum = new Cartesian3_default();
+var cartographicScratch = new Cartographic_default();
+var toPack = new Cartesian2_default();
+function createVerticesFromQuantizedTerrainMesh(parameters, transferableObjects) {
+  const quantizedVertices = parameters.quantizedVertices;
+  const quantizedVertexCount = quantizedVertices.length / 3;
+  const octEncodedNormals = parameters.octEncodedNormals;
+  const edgeVertexCount = parameters.westIndices.length + parameters.eastIndices.length + parameters.southIndices.length + parameters.northIndices.length;
+  const includeWebMercatorT = parameters.includeWebMercatorT;
+  const exaggeration = parameters.exaggeration;
+  const exaggerationRelativeHeight = parameters.exaggerationRelativeHeight;
+  const hasExaggeration = exaggeration !== 1;
+  const includeGeodeticSurfaceNormals = hasExaggeration;
+  const rectangle = Rectangle_default.clone(parameters.rectangle);
+  const west = rectangle.west;
+  const south = rectangle.south;
+  const east = rectangle.east;
+  const north = rectangle.north;
+  const ellipsoid = Ellipsoid_default.clone(parameters.ellipsoid);
+  const minimumHeight = parameters.minimumHeight;
+  const maximumHeight = parameters.maximumHeight;
+  const center = parameters.relativeToCenter;
+  const fromENU = Transforms_default.eastNorthUpToFixedFrame(center, ellipsoid);
+  const toENU = Matrix4_default.inverseTransformation(fromENU, new Matrix4_default());
+  let southMercatorY;
+  let oneOverMercatorHeight;
+  if (includeWebMercatorT) {
+    southMercatorY = WebMercatorProjection_default.geodeticLatitudeToMercatorAngle(south);
+    oneOverMercatorHeight = 1 / (WebMercatorProjection_default.geodeticLatitudeToMercatorAngle(north) - southMercatorY);
+  }
+  const uBuffer = quantizedVertices.subarray(0, quantizedVertexCount);
+  const vBuffer = quantizedVertices.subarray(
+    quantizedVertexCount,
+    2 * quantizedVertexCount
+  );
+  const heightBuffer = quantizedVertices.subarray(
+    quantizedVertexCount * 2,
+    3 * quantizedVertexCount
+  );
+  const hasVertexNormals = defined_default(octEncodedNormals);
+  const uvs = new Array(quantizedVertexCount);
+  const heights = new Array(quantizedVertexCount);
+  const positions = new Array(quantizedVertexCount);
+  const webMercatorTs = includeWebMercatorT ? new Array(quantizedVertexCount) : [];
+  const geodeticSurfaceNormals = includeGeodeticSurfaceNormals ? new Array(quantizedVertexCount) : [];
+  const minimum = scratchMinimum;
+  minimum.x = Number.POSITIVE_INFINITY;
+  minimum.y = Number.POSITIVE_INFINITY;
+  minimum.z = Number.POSITIVE_INFINITY;
+  const maximum = scratchMaximum;
+  maximum.x = Number.NEGATIVE_INFINITY;
+  maximum.y = Number.NEGATIVE_INFINITY;
+  maximum.z = Number.NEGATIVE_INFINITY;
+  let minLongitude = Number.POSITIVE_INFINITY;
+  let maxLongitude = Number.NEGATIVE_INFINITY;
+  let minLatitude = Number.POSITIVE_INFINITY;
+  let maxLatitude = Number.NEGATIVE_INFINITY;
+  for (let i = 0; i < quantizedVertexCount; ++i) {
+    const rawU = uBuffer[i];
+    const rawV = vBuffer[i];
+    const u = rawU / maxShort;
+    const v = rawV / maxShort;
+    const height = Math_default.lerp(
+      minimumHeight,
+      maximumHeight,
+      heightBuffer[i] / maxShort
+    );
+    cartographicScratch.longitude = Math_default.lerp(west, east, u);
+    cartographicScratch.latitude = Math_default.lerp(south, north, v);
+    cartographicScratch.height = height;
+    minLongitude = Math.min(cartographicScratch.longitude, minLongitude);
+    maxLongitude = Math.max(cartographicScratch.longitude, maxLongitude);
+    minLatitude = Math.min(cartographicScratch.latitude, minLatitude);
+    maxLatitude = Math.max(cartographicScratch.latitude, maxLatitude);
+    const position = ellipsoid.cartographicToCartesian(cartographicScratch);
+    uvs[i] = new Cartesian2_default(u, v);
+    heights[i] = height;
+    positions[i] = position;
+    if (includeWebMercatorT) {
+      webMercatorTs[i] = (WebMercatorProjection_default.geodeticLatitudeToMercatorAngle(
+        cartographicScratch.latitude
+      ) - southMercatorY) * oneOverMercatorHeight;
+    }
+    if (includeGeodeticSurfaceNormals) {
+      geodeticSurfaceNormals[i] = ellipsoid.geodeticSurfaceNormal(position);
+    }
+    Matrix4_default.multiplyByPoint(toENU, position, cartesian3Scratch);
+    Cartesian3_default.minimumByComponent(cartesian3Scratch, minimum, minimum);
+    Cartesian3_default.maximumByComponent(cartesian3Scratch, maximum, maximum);
+  }
+  const westIndicesSouthToNorth = copyAndSort(
+    parameters.westIndices,
+    function(a, b) {
+      return uvs[a].y - uvs[b].y;
+    }
+  );
+  const eastIndicesNorthToSouth = copyAndSort(
+    parameters.eastIndices,
+    function(a, b) {
+      return uvs[b].y - uvs[a].y;
+    }
+  );
+  const southIndicesEastToWest = copyAndSort(
+    parameters.southIndices,
+    function(a, b) {
+      return uvs[b].x - uvs[a].x;
+    }
+  );
+  const northIndicesWestToEast = copyAndSort(
+    parameters.northIndices,
+    function(a, b) {
+      return uvs[a].x - uvs[b].x;
+    }
+  );
+  let occludeePointInScaledSpace;
+  if (minimumHeight < 0) {
+    const occluder = new EllipsoidalOccluder_default(ellipsoid);
+    occludeePointInScaledSpace = occluder.computeHorizonCullingPointPossiblyUnderEllipsoid(
+      center,
+      positions,
+      minimumHeight
+    );
+  }
+  let hMin = minimumHeight;
+  hMin = Math.min(
+    hMin,
+    findMinMaxSkirts(
+      parameters.westIndices,
+      parameters.westSkirtHeight,
+      heights,
+      uvs,
+      rectangle,
+      ellipsoid,
+      toENU,
+      minimum,
+      maximum
+    )
+  );
+  hMin = Math.min(
+    hMin,
+    findMinMaxSkirts(
+      parameters.southIndices,
+      parameters.southSkirtHeight,
+      heights,
+      uvs,
+      rectangle,
+      ellipsoid,
+      toENU,
+      minimum,
+      maximum
+    )
+  );
+  hMin = Math.min(
+    hMin,
+    findMinMaxSkirts(
+      parameters.eastIndices,
+      parameters.eastSkirtHeight,
+      heights,
+      uvs,
+      rectangle,
+      ellipsoid,
+      toENU,
+      minimum,
+      maximum
+    )
+  );
+  hMin = Math.min(
+    hMin,
+    findMinMaxSkirts(
+      parameters.northIndices,
+      parameters.northSkirtHeight,
+      heights,
+      uvs,
+      rectangle,
+      ellipsoid,
+      toENU,
+      minimum,
+      maximum
+    )
+  );
+  const aaBox = new AxisAlignedBoundingBox_default(minimum, maximum, center);
+  const encoding = new TerrainEncoding_default(
+    center,
+    aaBox,
+    hMin,
+    maximumHeight,
+    fromENU,
+    hasVertexNormals,
+    includeWebMercatorT,
+    includeGeodeticSurfaceNormals,
+    exaggeration,
+    exaggerationRelativeHeight
+  );
+  const vertexStride = encoding.stride;
+  const size = quantizedVertexCount * vertexStride + edgeVertexCount * vertexStride;
+  const vertexBuffer = new Float32Array(size);
+  let bufferIndex = 0;
+  for (let j = 0; j < quantizedVertexCount; ++j) {
+    if (hasVertexNormals) {
+      const n = j * 2;
+      toPack.x = octEncodedNormals[n];
+      toPack.y = octEncodedNormals[n + 1];
+    }
+    bufferIndex = encoding.encode(
+      vertexBuffer,
+      bufferIndex,
+      positions[j],
+      uvs[j],
+      heights[j],
+      toPack,
+      webMercatorTs[j],
+      geodeticSurfaceNormals[j]
+    );
+  }
+  const edgeTriangleCount = Math.max(0, (edgeVertexCount - 4) * 2);
+  const indexBufferLength = parameters.indices.length + edgeTriangleCount * 3;
+  const indexBuffer = IndexDatatype_default.createTypedArray(
+    quantizedVertexCount + edgeVertexCount,
+    indexBufferLength
+  );
+  indexBuffer.set(parameters.indices, 0);
+  const percentage = 1e-4;
+  const lonOffset = (maxLongitude - minLongitude) * percentage;
+  const latOffset = (maxLatitude - minLatitude) * percentage;
+  const westLongitudeOffset = -lonOffset;
+  const westLatitudeOffset = 0;
+  const eastLongitudeOffset = lonOffset;
+  const eastLatitudeOffset = 0;
+  const northLongitudeOffset = 0;
+  const northLatitudeOffset = latOffset;
+  const southLongitudeOffset = 0;
+  const southLatitudeOffset = -latOffset;
+  let vertexBufferIndex = quantizedVertexCount * vertexStride;
+  addSkirt(
+    vertexBuffer,
+    vertexBufferIndex,
+    westIndicesSouthToNorth,
+    encoding,
+    heights,
+    uvs,
+    octEncodedNormals,
+    ellipsoid,
+    rectangle,
+    parameters.westSkirtHeight,
+    southMercatorY,
+    oneOverMercatorHeight,
+    westLongitudeOffset,
+    westLatitudeOffset
+  );
+  vertexBufferIndex += parameters.westIndices.length * vertexStride;
+  addSkirt(
+    vertexBuffer,
+    vertexBufferIndex,
+    southIndicesEastToWest,
+    encoding,
+    heights,
+    uvs,
+    octEncodedNormals,
+    ellipsoid,
+    rectangle,
+    parameters.southSkirtHeight,
+    southMercatorY,
+    oneOverMercatorHeight,
+    southLongitudeOffset,
+    southLatitudeOffset
+  );
+  vertexBufferIndex += parameters.southIndices.length * vertexStride;
+  addSkirt(
+    vertexBuffer,
+    vertexBufferIndex,
+    eastIndicesNorthToSouth,
+    encoding,
+    heights,
+    uvs,
+    octEncodedNormals,
+    ellipsoid,
+    rectangle,
+    parameters.eastSkirtHeight,
+    southMercatorY,
+    oneOverMercatorHeight,
+    eastLongitudeOffset,
+    eastLatitudeOffset
+  );
+  vertexBufferIndex += parameters.eastIndices.length * vertexStride;
+  addSkirt(
+    vertexBuffer,
+    vertexBufferIndex,
+    northIndicesWestToEast,
+    encoding,
+    heights,
+    uvs,
+    octEncodedNormals,
+    ellipsoid,
+    rectangle,
+    parameters.northSkirtHeight,
+    southMercatorY,
+    oneOverMercatorHeight,
+    northLongitudeOffset,
+    northLatitudeOffset
+  );
+  TerrainProvider_default.addSkirtIndices(
+    westIndicesSouthToNorth,
+    southIndicesEastToWest,
+    eastIndicesNorthToSouth,
+    northIndicesWestToEast,
+    quantizedVertexCount,
+    indexBuffer,
+    parameters.indices.length
+  );
+  transferableObjects.push(vertexBuffer.buffer, indexBuffer.buffer);
+  return {
+    vertices: vertexBuffer.buffer,
+    indices: indexBuffer.buffer,
+    westIndicesSouthToNorth,
+    southIndicesEastToWest,
+    eastIndicesNorthToSouth,
+    northIndicesWestToEast,
+    vertexStride,
+    center,
+    minimumHeight,
+    maximumHeight,
+    occludeePointInScaledSpace,
+    encoding,
+    indexCountWithoutSkirts: parameters.indices.length
+  };
+}
+function findMinMaxSkirts(edgeIndices, edgeHeight, heights, uvs, rectangle, ellipsoid, toENU, minimum, maximum) {
+  let hMin = Number.POSITIVE_INFINITY;
+  const north = rectangle.north;
+  const south = rectangle.south;
+  let east = rectangle.east;
+  const west = rectangle.west;
+  if (east < west) {
+    east += Math_default.TWO_PI;
+  }
+  const length = edgeIndices.length;
+  for (let i = 0; i < length; ++i) {
+    const index = edgeIndices[i];
+    const h = heights[index];
+    const uv = uvs[index];
+    cartographicScratch.longitude = Math_default.lerp(west, east, uv.x);
+    cartographicScratch.latitude = Math_default.lerp(south, north, uv.y);
+    cartographicScratch.height = h - edgeHeight;
+    const position = ellipsoid.cartographicToCartesian(
+      cartographicScratch,
+      cartesian3Scratch
+    );
+    Matrix4_default.multiplyByPoint(toENU, position, position);
+    Cartesian3_default.minimumByComponent(position, minimum, minimum);
+    Cartesian3_default.maximumByComponent(position, maximum, maximum);
+    hMin = Math.min(hMin, cartographicScratch.height);
+  }
+  return hMin;
+}
+function addSkirt(vertexBuffer, vertexBufferIndex, edgeVertices, encoding, heights, uvs, octEncodedNormals, ellipsoid, rectangle, skirtLength, southMercatorY, oneOverMercatorHeight, longitudeOffset, latitudeOffset) {
+  const hasVertexNormals = defined_default(octEncodedNormals);
+  const north = rectangle.north;
+  const south = rectangle.south;
+  let east = rectangle.east;
+  const west = rectangle.west;
+  if (east < west) {
+    east += Math_default.TWO_PI;
+  }
+  const length = edgeVertices.length;
+  for (let i = 0; i < length; ++i) {
+    const index = edgeVertices[i];
+    const h = heights[index];
+    const uv = uvs[index];
+    cartographicScratch.longitude = Math_default.lerp(west, east, uv.x) + longitudeOffset;
+    cartographicScratch.latitude = Math_default.lerp(south, north, uv.y) + latitudeOffset;
+    cartographicScratch.height = h - skirtLength;
+    const position = ellipsoid.cartographicToCartesian(
+      cartographicScratch,
+      cartesian3Scratch
+    );
+    if (hasVertexNormals) {
+      const n = index * 2;
+      toPack.x = octEncodedNormals[n];
+      toPack.y = octEncodedNormals[n + 1];
+    }
+    let webMercatorT;
+    if (encoding.hasWebMercatorT) {
+      webMercatorT = (WebMercatorProjection_default.geodeticLatitudeToMercatorAngle(
+        cartographicScratch.latitude
+      ) - southMercatorY) * oneOverMercatorHeight;
+    }
+    let geodeticSurfaceNormal;
+    if (encoding.hasGeodeticSurfaceNormals) {
+      geodeticSurfaceNormal = ellipsoid.geodeticSurfaceNormal(position);
+    }
+    vertexBufferIndex = encoding.encode(
+      vertexBuffer,
+      vertexBufferIndex,
+      position,
+      uv,
+      cartographicScratch.height,
+      toPack,
+      webMercatorT,
+      geodeticSurfaceNormal
+    );
+  }
+}
+function copyAndSort(typedArray, comparator) {
+  let copy;
+  if (typeof typedArray.slice === "function") {
+    copy = typedArray.slice();
+    if (typeof copy.sort !== "function") {
+      copy = void 0;
+    }
+  }
+  if (!defined_default(copy)) {
+    copy = Array.prototype.slice.call(typedArray);
+  }
+  copy.sort(comparator);
+  return copy;
+}
+var createVerticesFromQuantizedTerrainMesh_default = createTaskProcessorWorker_default(
+  createVerticesFromQuantizedTerrainMesh
+);
+export {
+  createVerticesFromQuantizedTerrainMesh_default as default
+};